問題詳情

Ozone _______ extremely active chemically, and succeeds in damaging any vegetation it comes incontact with.
(A) is
(B) being
(C) which is
(D) by being

參考答案

答案:A
難度:簡單0.718987
統計:A(284),B(31),C(40),D(7),E(0)

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